Set of bristles for a toothbrush



FIG. 1 is a perspective front view of a set of bristles for a toothbrush showing my new design;

FIG. 2 is an enlarged front view thereof;

FIG. 3 is an enlarged right side view thereof; and,

FIG. 4 is an enlarged left side view thereof.

The broken line showing of the remainder of the toothbrush is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design of a set of bristles for a toothbrush, as shown and described. 